There's an awful lot that doesn't tie up, in that story, and I wonder if that gunner was made to suffer unnecessarily.
The IO went on about the Mosquito's radio being out, yet Gibson was heard congratulating the bombers on a job well done, as he took his leave.
Why would an experienced Wing Commander, and ex-bomber pilot, creep up behind a bomber, knowing how edgy tailgunners could be, and not draw attention to himself, at the very least by flashing his navigation lamps?
Why would he sacrifice 100 mph advantage, to (allegedly) follow a bomber home, instead of haring back to somewhere over England, and baling out if he couldn't find somewhere to land?
How could he fail to find his way home, even if his radar (allegedly) was faulty? He had a gyro compass in front of him, a non-electrical pilot's compass to his front/left, and the navigator had his hand-held non-electrical Observer's compass, and all three couldn't possibly fail.
How, if he was shot down, did an eye-witness hear his engines stop, but fail to hear any gunfire?
How, if he was shot down, did another eye-witness see the aircraft coming down, with its cockpit lights on, but failed to mention that it was on fire?